JP2023142468A - Barrel polishing device and method - Google Patents

Abstract

To improve efficiency of polishing.SOLUTION: A barrel polishing device 1 comprises: a barrel tank 10 comprising, a bottom part 11 and a wall part 12 formed in a cylindrical shape and erected from the bottom part 11, and storing abrasive grains 60 at inside of the wall part 12; a barrel tank rotation device 20 for rotating the barrel tank 10 with a cylindrical center of a cylindrical shape being a shape of the wall part 12, as a barrel tank rotation center CB being a rotation center of the barrel tank 10; and a plurality of support members 30 which makes a workpiece 70 insert into the abrasive grains 60 stored in the barrel tank 10 for supporting the workpiece 70, and rotates around a support member rotation center CS being a rotation center which is almost parallel to the barrel tank rotation center CB. The barrel tank 10 relatively rotates to the workpiece 70 which is supported by the support members 30, and the plurality of support members 30 supports the workpiece 70 in an eccentric state of the workpiece, to the rotation center CS of the support members 30.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a barrel polishing device and a barrel polishing method.

Barrel polishing is one of the methods for polishing the surface of metal parts. In barrel polishing, a barrel filled with abrasive grains and water is rotated, and the workpiece is then placed in the barrel. As a result, the abrasive grains and water in the barrel tank rotate together with the barrel tank, and the abrasive grains collide with the workpiece, thereby processing the surface of the workpiece and polishing the surface of the workpiece.

For example, in the annular workpiece processing apparatus described in Patent Document 1, a workpiece supported by a support is buried in a polishing tank containing an abrasive material, and the workpiece is polished by rotating the polishing tank with a drive motor. There is. In addition, in the gyro machining device described in Patent Document 2, the workpiece to be chucked at the tip of the workpiece holding shaft is inserted into the abrasive material charged in the machining tank, and while the machining tank is rotated, the workpiece is The workpiece is machined by rotating and revolving around the machine.

Special Publication No. 62-46307 Japanese Patent Application Publication No. 3-213262

Here, when processing a workpiece by rotating the barrel tank with the workpiece placed in a barrel tank filled with abrasive grains, the abrasive grains are Depressions may occur on the surface of the grains. In other words, when processing a workpiece by rotating a barrel tank containing abrasive grains, when the abrasive grains rotating together with the barrel hit the workpiece from the upstream side in the rotational direction of the barrel tank. , the abrasive grains are displaced by the workpiece. The abrasive grains that were displaced by the workpiece do not immediately return to their original positions even on the downstream side of the workpiece in the rotational direction of the barrel tank, so there are fewer abrasive grains in the area where the displaced abrasive grains were. It appears as a depression.

In particular, when the amount of water introduced into the barrel tank together with the abrasive grains is small, the fluidity of the abrasive grains becomes low, and therefore, depressions are likely to occur on the surface of the abrasive grains on the downstream side in the rotational direction of the barrel tank. Barrel polishing equipment polishes the workpiece while rotating the barrel tank, so if a dent occurs on the surface of the abrasive grain, the dent will move in the circumferential direction of the barrel tank as the barrel rotates, and one rotation will be completed. The workpiece may be moved back to the position of the workpiece. Alternatively, if multiple workpieces are placed side by side along the circumferential direction of the barrel bath and when polishing multiple workpieces simultaneously, if a dent occurs on the surface of the abrasive grains, the dent may occur as the barrel rotates. However, the position of the workpiece located downstream of the workpiece that caused the depression may sometimes be reached. As shown above, when the depressions on the surface of the abrasive grains reach the position of the workpiece in the barrel tank, fewer abrasive grains hit the workpiece, so polishing of the workpiece is performed by colliding the abrasive grains with the workpiece. efficiency decreases.

On the other hand, when the amount of water introduced into the barrel tank together with the abrasive grains is increased, the fluidity of the abrasive grains becomes higher. Therefore, even if the abrasive grains hit the workpiece from the upstream side in the rotational direction of the barrel tank and are displaced, the abrasive grains easily flow to the position downstream of the workpiece. be able to. As a result, when the fluidity of the abrasive grains is high due to a large amount of water, depressions on the surface of the abrasive grains are less likely to occur even on the downstream side in the rotational direction of the barrel tank. However, when the water content is increased, the density of abrasive grains used for polishing the workpiece decreases, leading to a decrease in polishing efficiency when polishing the workpiece.

For these reasons, when polishing a workpiece by rotating a barrel tank containing abrasive grains and causing the abrasive grains to collide with the workpiece within the barrel tank, there is room for improvement in terms of polishing efficiency.

The present disclosure has been made in view of the above, and an object of the present disclosure is to provide a barrel polishing device and a barrel polishing method that can improve polishing efficiency.

A barrel polishing device of the present disclosure includes a bottom and a wall formed in a cylindrical shape and erected from the bottom, a barrel tank in which abrasive grains are stored inside the wall, and a barrel tank in which abrasive grains are stored inside the wall. a barrel tank rotation device that rotates the barrel tank with a cylindrical center as a rotation center of the barrel tank; a plurality of support members that support the workpiece and rotate around a support member rotation center that is a rotation center substantially parallel to the barrel tank rotation center, and the barrel tank is supported by the support members. The plurality of support members rotate relative to the workpiece, and each support the workpiece eccentrically with respect to the rotation center of the support member.

According to this configuration, since the workpiece is polished while rotating the support member that supports the workpiece eccentrically with respect to the center of rotation of the support member, even if a depression is generated on the surface of the abrasive grain by the workpiece, A workpiece located downstream in the rotational direction of the barrel tank with respect to the workpiece that has generated the depression can avoid the depression of the abrasive grains. As a result, the workpiece is collided with abrasive grains present at positions other than the depressions, so that the surface of the workpiece is processed by the colliding abrasive grains, and the surface of the workpiece is polished by the abrasive grains. Therefore, even in a state where dents are likely to occur on the surface of the abrasive grains during polishing of the workpiece, the workpiece can be polished while avoiding the dents in the abrasive grains, and the efficiency of the polishing process can be improved.

Preferably, the support member is configured such that the support members that are adjacent to each other in the circumferential direction around the barrel rotation center have different distances from the barrel rotation center to the workpiece. The workpiece is rotated about the member rotation center.

According to this configuration, adjacent workpieces on the downstream side in the rotational direction of the barrel tank can avoid dents in the abrasive grains generated by the workpiece on the upstream side in the rotational direction of the barrel tank in the radial direction of the barrel tank. can. Therefore, with respect to the workpiece that has generated the depression, the workpiece that is adjacent to the workpiece on the downstream side in the rotational direction of the barrel tank is polished using abrasive grains located on the outside or inside of the depression in the radial direction of the barrel tank. Therefore, the efficiency of polishing processing can be improved.

As a desirable form, the support member supports the plurality of workpieces with one support member eccentrically relative to the rotation center of the support member.

According to this configuration, it is possible to polish a plurality of workpieces supported by one support member while rotating each workpiece around the rotation center of the support member. Therefore, when polishing a workpiece, the dents generated in the abrasive grains by the plurality of workpieces supported by the support member on the upstream side in the rotational direction of the barrel bath can be removed by the adjacent support member on the downstream side in the rotational direction of the barrel bath. This can be avoided by supporting multiple respective workpieces. Therefore, when polishing many workpieces in one polishing operation, the surfaces of many workpieces can be effectively polished with the abrasive grains, and the efficiency of the polishing process can be improved.

As a desirable form, the support member includes a workpiece rotation device that rotates the workpiece around a workpiece rotation center that is eccentric with respect to the support member rotation center.

According to this configuration, when polishing the workpiece, the support member rotates the workpiece around the rotation center of the support member while rotating the workpiece around the rotation center of the workpiece that is eccentric to the rotation center of the support member. let This allows the workpiece to avoid dents caused in the abrasive grains by adjacent workpieces on the upstream side in the rotational direction of the barrel tank, and it is also possible to sequentially change the surface of the workpiece that the abrasive grains collide with. Therefore, the surface of the workpiece can be evenly polished with the abrasive grains, and the efficiency of the polishing process can be improved.

As a desirable form, the support member supports the shaft-shaped workpiece in a direction in which the axial direction of the workpiece is parallel to the rotation center of the support member.

According to this configuration, the abrasive grains that rotate relative to the workpiece can collide with each other from a direction perpendicular to the axial direction of the workpiece, so that the surface of the workpiece can be effectively Can be polished to Thereby, the efficiency of polishing processing can be improved.

In a desirable form, the plurality of supporting members are arranged such that when the barrel bath is rotated and the workpiece is polished by the abrasive grains, a depression formed on the surface of the abrasive grain by the workpiece is formed in the depression. It is arranged in a positional relationship that continues to the position of the workpiece supported by the support member adjacent to the support member that supports the formed workpiece on the downstream side in the rotational direction of the barrel tub.

According to this configuration, the plurality of support members are arranged in a positional relationship such that the distance between the support members in the circumferential direction of the barrel tank is relatively short, so when polishing the workpiece, one polishing process is performed. Many workpieces can be polished during work. As a result, many workpieces can be polished in one polishing operation while avoiding the dents generated in the abrasive grains by the workpiece when polishing the workpiece on the downstream side in the rotational direction of the barrel tank. , the efficiency of polishing process can be improved.

The barrel polishing method of the present disclosure includes a barrel tank having a bottom portion and a wall portion formed in a cylindrical shape and standing up from the bottom portion, and in which abrasive grains are stored inside the wall portion; a barrel tank rotation device that rotates the barrel tank with a cylindrical center as a rotation center of the barrel tank; a support member that supports the workpiece and rotates around a support member rotation center that is a rotation center substantially parallel to the barrel tank rotation center, and has a plurality of support members that individually support the workpiece. A barrel polishing method using a barrel polishing device, wherein the workpieces are supported by a plurality of support members eccentrically with respect to the rotation center of the support members, and the workpieces are supported by the support members. By rotating the support member around the rotation center of the support member while rotating the barrel tank relative to the workpiece, the workpiece is polished by the abrasive grains contained in the barrel tank. conduct.

According to this configuration, since the workpiece is polished while rotating the support member that supports the workpiece eccentrically with respect to the center of rotation of the support member, even if a depression is generated on the surface of the abrasive grain by the workpiece, A workpiece located downstream in the rotational direction of the barrel tank with respect to the workpiece that has generated the depression can avoid the depression of the abrasive grains. As a result, the workpiece is collided with abrasive grains present at positions other than the depressions, so that the surface of the workpiece is processed by the colliding abrasive grains, and the surface of the workpiece is polished by the abrasive grains. Therefore, even in a state where dents are likely to occur on the surface of the abrasive grains during polishing of the workpiece, the workpiece can be polished while avoiding the dents in the abrasive grains, and the efficiency of the polishing process can be improved.

The barrel polishing device and barrel polishing method according to the present disclosure have the effect of improving the efficiency of polishing.

FIG. 1 is a schematic cross-sectional view of a barrel polishing apparatus according to a first embodiment. FIG. 2 is a view taken along the line AA in FIG. FIG. 3 is a sectional view of a barrel polishing apparatus in which a workpiece is supported without eccentricity with respect to the center of rotation of a support member. FIG. 4 is a view taken along the line BB in FIG. 3. FIG. 5 is a sectional view taken along line CC in FIG. FIG. 6 is an explanatory diagram showing a state in which the barrel tank shown in FIG. 4 is rotated. FIG. 7 is a sectional view taken along line DD in FIG. FIG. 8 is a schematic cross-sectional view of a barrel polishing device according to the second embodiment. FIG. 9 is a schematic cross-sectional view of a barrel polishing device according to a third embodiment. FIG. 10 is a modification of the third embodiment, and is an explanatory diagram showing a form in which a workpiece rotation device is arranged on a support member having two support parts. FIG. 11 is a modification of the first embodiment, and is an explanatory diagram in a case where the supporting members have the same phase in the rotation direction. FIG. 12 is an explanatory diagram showing an example of a workpiece to be polished by a barrel polishing device.

Hereinafter, the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the following detailed description of the invention (hereinafter referred to as embodiment). Furthermore, the constituent elements in the embodiments below include those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components disclosed in the embodiments below can be combined as appropriate.

[First embodiment]
FIG. 1 is a schematic cross-sectional view of a barrel polishing apparatus 1 according to the first embodiment. FIG. 1 is a cross-sectional view of the barrel tank 10 viewed along a barrel rotation center CB, which is the rotation center of the barrel tank 10. The barrel polishing device 1 according to the first embodiment is a device for polishing the surface of a workpiece 70. The barrel polishing device 1 includes a barrel tank 10 that accommodates abrasive grains 60 used for polishing a workpiece 70, a barrel tank rotation device 20 that rotates the barrel tank 10, and a support member 30 that supports the workpiece 70. ing.

The barrel tank 10 has a bottom portion 11 formed in a substantially circular plate shape and a wall portion 12 formed in a cylindrical shape and erected from the bottom portion 11. 12 is formed upright from the outer peripheral portion of the bottom portion 11 . Therefore, the barrel tank 10 is formed in a cylindrical shape with a bottom, one end of which is closed by positioning the bottom part 11 at one end, and the other end side of the barrel tank 10 is It is formed as an opening 13 of. In the barrel polishing device 1, the axial direction of the cylindrical shape of the wall portion 12 of the barrel tank 10 is the vertical direction, the bottom portion 11 is located on the lower side with respect to the wall portion 12, and the opening portion 13 is on the upper side. Used in orientation.

In the following description, the upper side of the barrel polishing device 1 in the normal usage mode will be explained as the upper side of the barrel polishing device 1, and the lower side of the barrel polishing device 1 in the normal usage mode will be explained as the lower side of the barrel polishing device 1. .

Abrasive grains 60 housed in the barrel tank 10 are housed inside the wall portion 12 . That is, the abrasive grains 60 are stored in a space defined by the surface of the bottom 11 of the barrel tank 10 on which the wall 12 stands and the inner peripheral surface of the wall 12 formed in a cylindrical shape. Ru.

The abrasive grains 60 housed in the barrel tank 10 are granular abrasives, such as alumina, silicon carbide, or the like held together by a binder. A large amount of abrasive grains 60 formed into granules are housed in the barrel tank 10 along with a small amount of water.

The barrel tank rotation device 20 is capable of rotating the barrel tank 10 with the center of the cylindrical shape of the wall portion 12 as a barrel rotation center CB, which is the rotation center of the barrel tank 10. Specifically, the barrel shaft 14 is located on the surface of the bottom 11 of the barrel tank 10 opposite to the surface where the wall portion 12 is located, that is, the surface opposite to the surface where the abrasive grains 60 are accommodated. It is located. That is, the barrel shaft 14 is arranged to extend downward from the lower surface of the bottom 11 of the barrel tank 10. The barrel shaft 14 is disposed at a position where its axis coincides with the barrel rotation center CB, and is formed to extend from the bottom 11 in a direction along the barrel rotation center CB. A pulley 15 is attached to the end of the barrel shaft 14 opposite to the end on the side where the bottom portion 11 is located.

The barrel tank rotation device 20 has a drive device 21 that includes a drive motor and a speed reduction device, and rotates the barrel tank 10 by transmitting the driving force generated by the drive device 21 to the barrel shaft 14. is now possible. Specifically, a pulley 23 is attached to an output shaft 22 of the drive device 21 of the barrel tank rotating device 20, and a pulley 23 of the output shaft 22 of the drive device 21 and a pulley 15 of the barrel shaft 14 are connected to each other. A drive belt 24 is wound around the drive belt 24. Thereby, the barrel tank rotating device 20 transmits the driving force generated by the drive device 21 to the barrel shaft 14 via the drive belt 24, and rotates the barrel shaft 14 to rotate the barrel around the barrel tank rotation center CB. The tank 10 can be rotated.

The support member 30 that supports the workpiece 70 is capable of supporting the workpiece 70 by inserting the workpiece 70 into the abrasive grains 60 housed in the barrel tank 10. That is, the support member 30 allows the workpiece 70 supported by the support member 30 to enter the inside of the barrel tank 10 from the opening 13 of the barrel tank 10 and insert it into the abrasive grains 60 accommodated in the barrel tank 10. is now possible.

Specifically, the support member 30 includes a rotating shaft 31 having a shaft shape, an arm portion 32 extending from one end of the rotating shaft 31 in a direction orthogonal to the rotating shaft 31, and a side of the arm portion 32 that is connected to the rotating shaft 31. The support shaft 33 is connected to the end opposite to the end of the support shaft 33 . The rotating shaft 31 is arranged above the barrel tank 10 so that its extending direction is in the vertical direction. That is, the rotating shaft 31 is arranged with the axial direction thereof being substantially parallel to the barrel rotation center CB. Further, the rotation shaft 31 is disposed above the barrel tank 10 at a position different from the barrel tank rotation center CB.

Note that the rotation shaft 31 may be slightly inclined with respect to the barrel rotation center CB, and the rotation shaft 31 may be tilted, for example, at an axial direction of about 5 to 10 degrees with respect to the barrel rotation center CB. Good too. In the first embodiment, the rotation axis 31 is arranged substantially parallel to the barrel rotation center CB.

The upper end of the rotating shaft 31 extending in the vertical direction is connected to the support member rotating device 35 . The support member rotating device 35 includes a drive motor and a speed reduction device, and can rotate the rotating shaft 31 by the driving force generated by the drive motor. The rotating shaft 31 is rotatable about the axis of the rotating shaft 31 by a driving force transmitted from the support member rotating device 35.

The arm portion 32 is connected to the lower end of the rotating shaft 31 and extends in a direction perpendicular to the rotating shaft 31 . That is, when the rotating shaft 31 is arranged to extend in the vertical direction, the arm portion 32 is formed to extend in the horizontal direction.

The support shaft 33 is connected to the end of the arm portion 32 opposite to the end connected to the rotation shaft 31, and extends in a direction parallel to the direction in which the rotation shaft 31 extends. Further, the support shaft 33 extends from the arm portion 32 in a direction opposite to the direction in which the rotating shaft 31 extends from the arm portion 32 . That is, the rotation shaft 31 extends upward from the arm portion 32, whereas the support shaft 33 is formed to extend downward from the arm portion 32. In other words, the support shaft 33 extends from the arm portion 32 eccentrically with respect to the rotation shaft 31 .

A support part 34 that supports the workpiece 70 is disposed at the end of the support shaft 33 opposite to the end connected to the arm part 32, that is, at the lower end of the support shaft 33. The workpiece 70 to be polished in the first embodiment is a shaft-shaped workpiece 70, and the support portion 34 supports the end portion of the shaft-shaped workpiece 70. At this time, the support portion 34 supports the workpiece 70 such that the axial direction of the shaft-shaped workpiece 70 is aligned with the axial direction of the support shaft 33 . That is, the support portion 34 positions the workpiece 70 on an extension of the support shaft 33 and supports the upper end of the workpiece 70 . Thereby, the support part 34 supports the shaft-shaped workpiece 70 in such a direction that the workpiece 70 extends downward from the support part 34 located at the lower end of the support shaft 33 .

In this way, the support member 30 that supports the workpiece 70 is configured to be rotatable about the axis of the rotating shaft 31 by the support member rotation device 35. Since the rotating shaft 31 is arranged with its axial direction substantially parallel to the barrel tank rotation center CB, when the rotating shaft 31 is rotated by the support member rotation device 35, the supporting member 30 is It rotates around a rotation axis 31 that is substantially parallel to the rotation center CB. In other words, the support member 30 whose rotation shaft 31 is rotated by the support member rotation device 35 is rotatable with the axis of the rotation shaft 31 as the support member rotation center CS, which is the rotation center of the support member 30, and the barrel It can rotate around a support member rotation center CS that is substantially parallel to the tank rotation center CB.

In this case, the approximately parallelism of the support member rotation center CS to the barrel rotation center CB means that the support member rotation center CS is substantially parallel to the barrel rotation center CB, not only when the angle of inclination of the support member rotation center CS to the barrel rotation center CB is 0°. This includes a range where the angle of inclination is 10°. That is, the support member 30 is rotatable about the support member rotation center CS whose inclination angle with respect to the barrel rotation center CB is within the range of 0° or more and 10° or less. In the first embodiment, the angle of inclination of the support member rotation center CS with respect to the barrel rotation center CB is substantially 0°.

In this way, the support member 30 that is rotatable around the support member rotation center CS has the support shaft 33 that is eccentric with respect to the rotation axis 31, and the shaft-shaped workpiece 70 is positioned on the extension line of the support shaft 33. is supported in such a direction that the axial direction of the workpiece 70 is parallel to the support member rotation center CS. Therefore, the support member 30 supports the shaft-shaped workpiece 70 eccentrically with respect to the support member rotation center CS, and supports the workpiece 70 eccentrically with respect to the support member rotation center CS. It is rotatable around the member rotation center CS.

A plurality of support members 30 that individually support workpieces 70 are arranged in the barrel polishing device 1 . The plurality of support members 30 each support the workpiece 70 eccentrically with respect to the support member rotation center CS, and are rotatable about the respective support member rotation center CS by the driving force generated by the support member rotation device 35. It has become.

FIG. 2 is a view taken along the line AA in FIG. The plurality of support members 30 are arranged at equal intervals in the circumferential direction of the barrel tank 10 around the barrel rotation center CB. In the first embodiment, the four support members 30 are arranged at equal intervals in the circumferential direction of the barrel tank 10 around the barrel rotation center CB. Thereby, the barrel polishing apparatus 1 according to the first embodiment can polish four workpieces 70 at the same time. Note that the number of support members 30 that the barrel polishing device 1 has may be other than four, that is, the number of workpieces 70 that can be simultaneously polished by the barrel polishing device 1 may be other than four. Good too.

The plurality of support members 30 are all located at the same position in the radial direction of the barrel tank 10 with the barrel tank rotation center CB as the center. The positions of the support members 30 in the circumferential direction and the radial direction around the barrel rotation center CB are the positions of the rotation shafts 31 of the respective support members 30. In other words, the positions of the support member rotation centers CS of the plurality of support members 30 are equally spaced in the circumferential direction around the barrel rotation center CB, and the distance of the support member rotation center CS from the barrel rotation center CB is The supporting members 30 are arranged in an equal positional relationship.

Furthermore, the support members 30 have different phases in the rotation direction of the support members 30 about the support member rotation center CS between the support members 30 that are adjacent to each other in the circumferential direction of the barrel tank 10 about the barrel rotation center CB. ing.

In this case, the phase of the support member 30 in the rotational direction is equal to the support member rotation center CS in the case where the positions of the support member rotation center CS in the circumferential direction of the barrel tank 10 centering on the barrel tank rotation center CB are at the same position. It is oriented in the rotational direction of the support member 30. For example, the workpiece 70 supported by each of two arbitrary support members 30 is located at the outermost position in the radial direction of the barrel tank 10, both of which are centered on the barrel tank rotation center CB, with respect to the support member rotation center CS. In this case, these two support members 30 have the same phase in the rotation direction.

In the first embodiment, the phases of the support members 30 in the rotational direction defined as described above are different between support members 30 adjacent to each other in the circumferential direction of the barrel tank 10 centered on the barrel tank rotation center CB. . In other words, the support members 30 are arranged such that the distance of the workpiece 70 from the barrel rotation center CB is different between support members 30 that are adjacent to each other in the circumferential direction of the barrel tank 10 with the barrel rotation center CB as the center. Then, the workpiece 70 is rotated about the support member rotation center CS.

In the first embodiment, the support members 30 are arranged around the support member rotation center CS such that the distances of the workpieces 70 from the barrel tank rotation center CB are different distances in all the plurality of support members 30 arranged. The workpiece 70 is rotated. That is, all the support members 30 of the plurality of support members 30 have different phases in the rotation direction of the support members 30 .

Next, a method of barrel polishing the workpiece 70 using the barrel polishing device 1 will be described. When polishing the workpiece 70 using the barrel polishing device 1, the abrasive grains 60 and a small amount of water are introduced into the barrel tank 10 from the opening 13 of the barrel tank 10 of the barrel polishing device 1. For example, the abrasive grains 60 are added in an amount such that the depth from the surface 61 of the abrasive grains 60 is equal to or greater than the length of the workpiece 70 to be polished.

The surface 61 of the abrasive grains 60 in this case refers to the surface located on the upper side of the large amount of abrasive grains 60 accommodated in the barrel tank 10. That is, the surface 61 of the abrasive grains 60 in this case does not represent the surface of each individual abrasive grain 60 but the entire surface of a large amount of abrasive grains 60 accommodated in the barrel tank 10.

A workpiece 70 to be polished using the barrel polishing device 1 is supported by a support portion 34 included in the support member 30 . The support member 30 individually supports the plurality of workpieces 70 using the plurality of support members 30 . After the plurality of workpieces 70 are supported by the plurality of support members 30, the workpieces 70 supported by the support members 30 are inserted into the abrasive grains 60 accommodated in the barrel tank 10. When inserting the workpiece 70 into the abrasive grains 60 housed in the barrel tank 10, the workpiece 70 is inserted at least until the part of the workpiece 70 to be polished enters into the abrasive grains 60.

The workpiece 70 is inserted into the abrasive grains 60 housed in the barrel tank 10 to such a depth that the support member 30 that supports the workpiece 70 is not inserted into the abrasive grains 60 . That is, the support member 30 that supports the workpiece 70 is exposed from the abrasive grain 60 even when the workpiece 70 is inserted into the abrasive grain 60 .

These operations are performed, for example, by supporting the workpiece 70 with the support member 30 above the barrel tank 10, and after supporting the workpiece 70 with the support member 30, supporting it toward the barrel tank 10 containing the abrasive grains 60. By lowering the member 30, the workpiece 70 supported by the support member 30 is inserted into the abrasive grains 60 housed in the barrel tank 10.

After inserting the workpiece 70 into the abrasive grains 60, the barrel tank 10 is rotated relative to the workpiece 70 supported by the support member 30. When the barrel tank 10 is rotated relative to the workpiece 70, the abrasive grains 60 accommodated in the barrel tank 10 also rotate with the rotation of the barrel tank 10, so the abrasive grains 60 also rotate relative to the workpiece 70. Perform relative rotation. Since the workpiece 70 is inserted into the abrasive grain 60, when the abrasive grain 60 rotates relative to the workpiece 70, the abrasive grain 60 rotates relative to the workpiece 70 while colliding with the workpiece 70. The surface of the workpiece 70 is gradually worked and polished by repeatedly colliding the abrasive grains 60 that rotate relative to the workpiece 70 .

Specifically, the barrel tank 10 rotates around the barrel rotation center CB by the driving force transmitted from the barrel rotation device 20. Thereby, the barrel tank 10 rotates relative to the workpiece 70 supported by the support member 30. Further, in the first embodiment, when polishing the workpiece 70 while rotating the barrel bath 10, the support member 30 that supports the workpiece 70 is rotated by the driving force generated by the support member rotation device 35. . Thereby, the support member 30 rotates around the support member rotation center CS.

When the barrel tank 10 is rotated, the abrasive grains 60 accommodated in the barrel tank 10 rotate together with the barrel tank 10 as the barrel tank 10 rotates. Therefore, the abrasive grains 60 accommodated in the barrel tank 10 rotate together with the barrel tank 10 around the barrel tank rotation center CB, and rotate relative to the workpiece 70 supported by the support member 30. As a result, the abrasive grains 60 repeatedly collide with the workpiece 70, and the surface of the workpiece 70 is polished by the abrasive grains 60 that collide repeatedly.

Here, in the barrel polishing method according to the first embodiment, in order to ensure the density of the abrasive grains 60 and increase the polishing efficiency of the workpiece 70, the amount of water introduced into the barrel tank 10 together with the abrasive grains 60 is reduced. are doing. This increases the density of the abrasive grains 60 in the barrel tank 10, so when the barrel tank 10 is rotated relative to the workpiece 70, the amount of abrasive grains 60 colliding with the workpiece 70 per hour increases. can be done. Therefore, the efficiency of polishing the workpiece 70 by colliding the abrasive grains 60 with the workpiece 70 can be increased.

However, when the amount of water introduced into the barrel tank 10 together with the abrasive grains 60 is small, the fluidity of the abrasive grains 60 is reduced. Therefore, by rotating the barrel tank 10 relative to the workpiece 70, when polishing the workpiece 70 with the abrasive grains 60, the abrasive grains are placed on the downstream side of the workpiece 70 in the rotational direction of the barrel tank 10. Depressions are likely to occur when the grains 60 are pushed away by the workpiece 70.

Here, the movement of the abrasive grains 60 when the barrel tank 10 is rotated relative to the workpiece 70 will be explained. In order to compare the movement of the abrasive grains 60 with the first embodiment, the support part 34 that supports the workpiece 70 in the support member 30 is not eccentric with respect to the rotating shaft 31, and the workpiece 70 is The movement of the abrasive grains 60 in a form in which they are supported without eccentricity with respect to the rotation center CS will be explained.

FIG. 3 is a cross-sectional view of the barrel polishing apparatus 100 in which the workpiece 70 is supported without eccentricity with respect to the support member rotation center CS. FIG. 4 is a view taken along the line BB in FIG. 3. FIG. 5 is a sectional view taken along line CC in FIG. In the barrel polishing apparatus 100 shown in FIG. 3, a support portion 134 that supports a workpiece 70 is connected to the lower end of a rotating shaft 131 that a support member 130 has. Thereby, as shown in FIG. 4, the workpiece 70 is supported by the support member 130 without being eccentric with respect to the support member rotation center CS. When the workpiece 70 is thus supported without eccentricity with respect to the support member rotation center CS, before polishing is performed by the barrel polishing device 100, that is, before the barrel tank 110 is rotated, the barrel The abrasive grains 60 housed in the tank 110 have a flat surface 61, as shown in FIG. Workpiece 70 supported by support member 130 is inserted into abrasive grains 60 contained in barrel bath 110 .

FIG. 6 is an explanatory diagram showing a state in which the barrel tank 110 shown in FIG. 4 is rotated. FIG. 7 is a sectional view taken along line DD in FIG. When polishing the workpiece 70 by inserting it into the abrasive grains 60 in the barrel tank 110, the workpiece 70 is rotated while the barrel tank 110 is rotated. The workpiece 70 is rotated by rotating the support member 130 by the support member rotation device 135. Thereby, the workpiece 70 rotates together with the support member 130 about the support member rotation center CS. Since the workpiece 70 is supported without eccentricity with respect to the support member rotation center CS, when the support member 130 is rotated, the workpiece 70 substantially rotates around the axis of the workpiece 70. do.

The barrel tank 110 is rotated by a barrel tank rotation device (see FIG. 1). Thereby, the barrel tank 110 rotates around the barrel tank rotation center CB. When the barrel tank 110 is rotated, the abrasive grains 60 accommodated in the barrel tank 110 rotate together with the barrel tank 110, so that they tend to move outward in the radial direction of the barrel tank 110 due to centrifugal force. Therefore, the abrasive grains 60 in the barrel tank 110 are biased toward the outside in the radial direction of the barrel tank 110, as shown in FIG.

Further, when the barrel tank 110 is rotated, the barrel tank 110 rotates relative to the workpiece 70. That is, although the support member 130 that supports the workpiece 70 rotates around the support member rotation center CS, it does not rotate integrally with the barrel tank 110, so when the barrel tank 110 is rotated, the barrel tank 110 , rotates relative to the workpiece 70 supported by the support member 130. Therefore, when the barrel tank 110 is rotated, the abrasive grains 60 accommodated in the barrel tank 110 also rotate relative to the workpiece 70 supported by the support member 130.

When the abrasive grains 60 housed in the barrel tank 110 rotate relative to the workpiece 70, the abrasive grains 60 repeatedly collide with the workpiece 70. As a result, the surface of the workpiece 70 is polished by the abrasive grains 60. In this way, when polishing the workpiece 70 while rotating the abrasive grains 60 relative to the workpiece 70, the abrasive grains 60 are pushed away by the workpiece 70 on the downstream side in the rotation direction of the barrel tank 110. As a result, a depression 62 is generated. The depressions 62 are generated in the form that the surface 61 of the abrasive grains 60 is depressed when the abrasive grains 60 housed in the barrel tank 110 are pushed away by the workpiece 70 .

If the fluidity of the abrasive grains 60 is low due to the small amount of water input into the barrel tank 10 together with the abrasive grains 60, the depressions 62 generated in the abrasive grains 60 will not be smoothed out by the flow of the abrasive grains 60 and will not be smoothed out by the flow of the abrasive grains 60. The target remains for a long time. Therefore, the abrasive grains 60 rotate relative to the workpiece 70, and the depressions 62 generated by the abrasive grains 60 being pushed away by the workpiece 70 are caused by the barrel It reaches the position of the workpiece 70 located on the downstream side in the rotational direction of the tank 110.

Since the depression 62 is a part where the abrasive grain 60 does not exist, when the depression 62 of the abrasive grain 60 reaches the position of the workpiece 70, the abrasive grain 60 no longer collides with the workpiece 70, or the workpiece 70 The amount of abrasive grains 60 colliding with each other is reduced. Therefore, the workpiece 70 that has been reached by the depressions 62 of the abrasive grains 60 becomes difficult to be polished by the abrasive grains 60.

The depressions 62 in the abrasive grains 60 are generated by each of the plurality of workpieces 70 inserted into the abrasive grains 60, and the depressions 62 generated in the workpieces 70 are caused by the workpieces 70 on the downstream side in the rotational direction of the barrel tank 110. Therefore, the depressions 62 of the abrasive grains 60 continuously reach the workpiece 70. Therefore, it becomes difficult for the workpiece 70 to be continuously polished by the abrasive grains 60.

In the barrel polishing device 1 according to the first embodiment, when the barrel tank 10 is rotated and the workpiece 70 is polished by the abrasive grains 60, the depressions 62 generated on the surface 61 of the abrasive grains 60 by the workpiece 70 are The plurality of support members 30 are arranged in a positional relationship that continues to the position of the workpiece 70 on the downstream side in the rotational direction of the barrel tank 10. In other words, the plurality of support members 30 are arranged such that the depressions 62 formed on the surface 61 of the abrasive grains 60 by the workpiece 70 are rotated by the rotation of the barrel tank 10 relative to the support member 30 supporting the workpiece 70 in which the depressions 62 are formed. They are arranged in a positional relationship that continues to the position of the workpiece 70 supported by the adjacent support members 30 on the downstream side in the direction.

In the first embodiment in which a plurality of support members 30 are arranged in such a positional relationship, the support member 30 has a rotating shaft 31, an arm portion 32, and a support shaft 33, and the workpiece 70 is It is supported eccentrically with respect to the rotation center CS. Therefore, when the support member 30 is rotated around the support member rotation center CS by the support member rotation device 35, the workpiece 70 supported by the support member 30 is rotated at a position away from the support member rotation center CS. Rotate around the center CS.

When the workpiece 70 is supported eccentrically with respect to the support member rotation center CS and the workpiece 70 is rotated around the support member rotation center CS, the workpiece 70 reciprocates in the radial direction of the barrel tank 10. Become. In other words, when the workpiece 70 is rotated around the support member rotation center CS, the components in the movement direction of the workpiece 70 include movement in the radial direction of the barrel tank 10 and movement in the circumferential direction of the barrel tank 10. Contains components in both directions. Therefore, when the workpiece 70 is rotated around the support member rotation center CS, the workpiece 70 also reciprocates in the radial direction of the barrel tank 10 about the support member rotation center CS.

When polishing the workpiece 70 with the barrel polishing apparatus 1 according to the first embodiment, polishing is performed while rotating the support member 30 that supports the workpiece 70 eccentrically with respect to the support member rotation center CS. To do this, the workpiece 70 is reciprocated in the radial direction of the barrel bath 10 within the abrasive grains 60 housed in the barrel bath 10 . As a result, by rotating the barrel tank 10 relative to the workpiece 70, the abrasive grains 60 accommodated in the barrel tank 10 rotate relative to the workpiece 70, and depressions 62 are generated on the surface 61 of the abrasive grains 60. Even in this case, the workpiece 70 can avoid the depressions 62 of the abrasive grains 60.

In other words, the depression 62 generated by the abrasive grains 60 being pushed away by the workpiece 70 is located on the downstream side of the workpiece 70 in the rotational direction of the barrel tank 10 with respect to the workpiece 70 that generated the depression 62. Even when the workpiece 70 reaches the position 70, the workpiece 70 on the downstream side moves in the radial direction of the barrel tank 10 as the support member 30 rotates. Therefore, the depression 62 generated by the abrasive grains 60 being pushed away by the workpiece 70 located on the upstream side in the rotation direction of the barrel tank 10 reaches the position of the workpiece 70 on the downstream side in the rotation direction of the barrel tank 10. Even in this case, the workpiece 70 on the downstream side can avoid the depression 62 in the radial direction of the barrel tank 10.

As a result, the workpiece 70 on the downstream side collides with the abrasive grains 60 present at positions other than the depressions 62, so the surface of the workpiece 70 is processed by the colliding abrasive grains 60, and the surface is processed by the abrasive grains 60. Polished. Therefore, in the barrel polishing apparatus 1 according to the first embodiment, the abrasive grains 60 can be easily formed even in a state in which depressions 62 are likely to occur on the surface 61 of the abrasive grains 60 during polishing of the workpiece 70 due to the low fluidity of the abrasive grains 60. The workpiece 70 can be polished while avoiding the depressions 62. As a result, the efficiency of polishing can be improved.

Further, the support members 30 are arranged such that the distances of the workpieces 70 from the barrel rotation center CB are different between support members 30 that are adjacent to each other in the circumferential direction of the barrel tank 10 with the barrel rotation center CB as the center. , the workpiece 70 can be rotated about the support member rotation center CS. For this reason, the depressions 62 of the abrasive grains 60 generated by the workpiece 70 on the upstream side in the rotational direction of the barrel tank 10 can be avoided in the radial direction of the barrel tank 10 on the downstream side in the rotational direction of the barrel tank 10. can be avoided. Therefore, the workpiece 70 adjacent to the workpiece 70 that has generated the recess 62 on the downstream side in the rotational direction of the barrel tank 10 is located on the outside or inside of the recess 62 in the radial direction of the barrel tank 10. The surface can be polished by the abrasive grains 60. As a result, the efficiency of polishing can be improved.

In addition, since the support member 30 supports the shaft-shaped workpiece 70 in a direction in which the axial direction of the workpiece 70 is parallel to the support member rotation center CS, the abrasive grains rotate relative to the workpiece 70. 60 can be caused to collide with the workpiece 70 from a direction perpendicular to the axial direction thereof. Thereby, the surface of the workpiece 70 can be effectively polished by the abrasive grains 60. As a result, the efficiency of polishing can be improved.

Further, the plurality of support members 30 are arranged so that the depressions 62 generated on the surface 61 of the abrasive grains 60 by the workpiece 70 during polishing of the workpiece 70 continue to the position of the workpiece 70 on the downstream side in the rotational direction of the barrel tank 10. They are arranged in a positional relationship. That is, the plurality of support members 30 are arranged in a positional relationship such that the distance between the support members 30 in the circumferential direction of the barrel tank 10 is relatively short. Therefore, while avoiding the depressions 62 generated in the abrasive grains 60 by the workpiece 70 when polishing the workpiece 70 with the workpiece 70 on the downstream side in the rotational direction of the barrel tank 10, many workpieces can be polished in one polishing operation. 70 can be polished. As a result, the efficiency of polishing can be improved.

Further, when inserting the workpiece 70 into the abrasive grains 60 housed in the barrel tank 10, the support member 30 that supports the workpiece 70 is not inserted into the abrasive grains 60, and the support member 30 is exposed from the abrasive grains 60. Therefore, rotational resistance when rotating the barrel tank 10 and the support member 30 can be suppressed. Thereby, the drive motor included in the barrel tank rotation device 20 that rotates the barrel tank 10 and the drive motor included in the support member rotation device 35 that rotates the support member 30 can be downsized. As a result, manufacturing costs can be reduced.

[Second embodiment]
Next, a barrel polishing apparatus 1 according to a second embodiment will be described. Components that are the same as those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted. Hereinafter, the differences from the first embodiment will be mainly explained.

FIG. 8 is a schematic cross-sectional view of the barrel polishing device 1 according to the second embodiment. In addition, in FIG. 8, the barrel tank rotating device 20 (see FIG. 1) that rotates the barrel tank 10 is omitted from illustration. Also in the second embodiment, the barrel polishing device 1 includes a barrel tank 10 that accommodates abrasive grains 60 and a support member 30 that supports a workpiece 70. Further, the support member 30 supports the workpiece 70 eccentrically with respect to the support member rotation center CS, and can rotate around the support member rotation center CS.

Furthermore, in the second embodiment, the support member 30 includes a workpiece rotation device 40 that rotates the workpiece 70 around a workpiece rotation center CW, which is a rotation center eccentric with respect to the support member rotation center CS. . Specifically, the workpiece rotation device 40 is connected to the lower end of the support shaft 33 that the support member 30 has, and the support portion 34 that supports the workpiece 70 is attached to the workpiece rotation device 40 .

The workpiece rotation device 40 includes a drive motor and a speed reduction device, and can rotate the support portion 34 by the drive force generated by the drive motor. The support portion 34 is rotatable by the driving force transmitted from the workpiece rotation device 40. That is, the support portion 34 that supports the workpiece 70 can rotate relative to the support shaft 33 by the driving force transmitted from the workpiece rotation device 40.

The workpiece rotation center CW when the workpiece rotation device 40 relatively rotates the support portion 34 is a rotation center that is parallel to the support member rotation center CS and eccentric to the support member rotation center CS. In the second embodiment, the workpiece rotation center CW when the workpiece rotation device 40 rotates the support portion 34 substantially coincides with the axis of the support shaft 33 to which the workpiece rotation device 40 is connected. ing.

In the second embodiment, since the support member 30 can rotate the support part 34 relative to the support shaft 33 by the workpiece rotation device 40 in this way, the workpiece 70 supported by the support part 34 can be It can be rotated relative to the support shaft 33. In other words, the support member 30 is capable of rotating the workpiece 70 supported by the support portion 34 around the workpiece rotation center CW eccentric to the support member rotation center CS.

Also in the second embodiment configured as described above, when polishing the workpiece 70, the barrel tank 10 containing the abrasive grains 60 is rotated about the barrel tank rotation center CB. Thereby, the abrasive grains 60 accommodated in the barrel tank 10 are rotated relative to the workpiece 70 supported by the support member 30.

Also in the second embodiment, the support member 30 is rotated about the support member rotation center CS by the driving force generated by the support member rotation device 35. As a result, the workpiece 70 supported at a position eccentric to the support member rotation center CS is rotated around the support member rotation center CS. As a result, the workpiece 70 is polished with the abrasive grains 60 housed in the barrel tank 10 while reciprocating in the radial direction of the barrel tank 10, and the depressions 62 generated on the surface 61 of the abrasive grains 60 by the workpiece 70 are polished. Polishing is performed while avoiding this in the radial direction of the barrel tank 10.

Further, in the second embodiment, when polishing the workpiece 70, the workpiece 70 is rotated by the workpiece rotation device 40 included in the support member 30. The workpiece rotation device 40 rotates the support portion 34 with respect to the support shaft 33 around the workpiece rotation center CW using the driving force generated by the workpiece rotation device 40 . Thereby, the workpiece rotation device 40 rotates the workpiece 70 supported by the support part 34 with respect to the support shaft 33 around the workpiece rotation center CW eccentric to the support member rotation center CS.

In the second embodiment, when polishing the workpiece 70 in this manner, the support member 30 supporting the workpiece 70 rotates the workpiece 70 around the support member rotation center CS while rotating the workpiece 70 with respect to the support member rotation center CS. The workpiece 70 is rotated around the eccentric workpiece rotation center CW. Thereby, the workpiece 70 can avoid the depressions 62 generated in the abrasive grains 60 by the workpieces 70 adjacent to each other on the upstream side in the rotation direction of the barrel tank 10, and the abrasive grains in the workpiece 70 with which the abrasive grains 60 collide. The surface that 60 collides with can be sequentially changed. Therefore, the surface of the workpiece 70 can be evenly polished by the abrasive grains 60, and the workpiece 70 can be effectively polished. As a result, the efficiency of polishing can be improved.

[Third embodiment]
Next, a barrel polishing apparatus 1 according to a third embodiment will be described. Components that are the same as those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted. Hereinafter, the differences from the first embodiment will be mainly explained.

FIG. 9 is a schematic cross-sectional view of the barrel polishing device 1 according to the third embodiment. In addition, in FIG. 9, the barrel tank rotating device 20 (see FIG. 1) that rotates the barrel tank 10 is omitted from illustration. Also in the third embodiment, the barrel polishing device 1 includes a barrel tank 10 that accommodates abrasive grains 60 and a support member 30 that supports a workpiece 70. Further, the support member 30 supports the workpiece 70 eccentrically with respect to the support member rotation center CS, and can rotate around the support member rotation center CS.

Furthermore, in the third embodiment, the support member 30 is capable of supporting a plurality of workpieces 70 eccentrically with respect to the support member rotation center CS. Specifically, in the first embodiment, the arm part 32 of the support member 30 extends in one direction from the rotation axis 31 in a direction perpendicular to the rotation axis 31, whereas in the third embodiment, the arm part 32 extends in one direction from the rotation axis 31 in a direction perpendicular to the rotation axis 31. It is formed to extend in two directions from the rotation axis 31 in a direction perpendicular to the rotation axis 31 . In other words, in the third embodiment, the support member 30 has an arm portion 32 extending in a direction perpendicular to the rotation shaft 31, and the rotation shaft 31 is located near the center of the arm portion 32 in the direction in which the arm portion 32 extends. 32.

In the third embodiment, one support member 30 has two support shafts 33, and the two support shafts 33 are respectively connected to both ends of the arm portion 32 in the extending direction. That is, in the third embodiment, in the support member 30, the rotating shaft 31 extends upward from near the center in the extending direction of the arm 32, and the two supporting shafts 33 extend downward from both ends in the extending direction of the arm 32. It is formed by extending to.

At the lower ends of the two support shafts 33 extending downward from the arm portion 32, support portions 34 that support the workpiece 70 are arranged. That is, in the third embodiment, one support member 30 has two support parts 34, and therefore, one support member 30 can support two workpieces 70. It has become.

At this time, the two support shafts 33 on which the support parts 34 are respectively arranged are connected to the arm part 32 at a position different from the position where the rotating shaft 31 is connected to the arm part 32 in the extending direction of the arm part 32. ing. Therefore, the two support shafts 33 on which the support parts 34 that support the workpieces 70 are arranged are eccentric with respect to the support member rotation center CS, and the two workpieces 70 supported by the two support parts 34 are supported at positions eccentric to the support member rotation center CS.

Also in the third embodiment configured in this way, when polishing the workpiece 70, the barrel tank 10 containing the abrasive grains 60 is rotated about the barrel tank rotation center CB. Thereby, the abrasive grains 60 accommodated in the barrel tank 10 are rotated relative to the workpiece 70 supported by the support member 30.

Further, in the third embodiment, the support member 30 has two support parts 34 that support the workpieces 70, and the two workpieces 70 are supported by one support member 30. The support member 30 inserts the two workpieces 70 to be supported into the abrasive grains 60 housed in the barrel tank 10, and uses the driving force generated by the support member rotation device 35 to separate the two workpieces 70 supported by the one support member 30. The workpieces 70 are each rotated around the support member rotation center CS. Thereby, the two workpieces 70 supported by the support member 30 are polished by the abrasive grains 60 housed in the barrel tank 10 while reciprocating in the radial direction of the barrel tank 10 .

Therefore, when polishing the workpiece 70, the depressions 62 generated in the abrasive grains 60 by the two workpieces 70 supported by the support member 30 on the upstream side in the rotational direction of the barrel bath 10 are This can be avoided with two respective workpieces 70 supported by side-adjacent support members 30. Therefore, when polishing many workpieces 70 in one polishing operation, the surfaces of many workpieces 70 can be effectively polished by the abrasive grains 60. As a result, the efficiency of polishing can be improved.

[Modified example]
Note that the embodiments described above may be combined as appropriate. FIG. 10 is a modification of the third embodiment, and is an explanatory diagram showing a form in which a workpiece rotation device 40 is arranged on a support member 30 having two support parts 34. In a configuration in which the support member 30 has two support parts 34 that support the workpiece 70 as in the third embodiment, the support part 34 is rotated about the workpiece rotation center CW as in the second embodiment. Two workpiece rotation devices 40 may be provided to match the support portions 34. That is, by arranging the workpiece rotation device 40 for each of the two support parts 34, the two workpieces 70 supported by the two support parts 34 of the support member 30 can be rotated around the workpiece rotation center CW. It may also be possible to rotate around the center.

By supporting two workpieces 70 eccentrically with respect to the support member rotation center CS by one support member 30, it is possible to polish many workpieces 70 in one polishing operation. Since the polishing can be performed while avoiding the depressions 62 that occur in the grains 60, many workpieces 70 can be effectively polished. Furthermore, by rotating the two workpieces 70 supported by one support member 30, it is possible to sequentially change the surface of the workpiece 70 on which the abrasive grains 60 collide, and the workpiece 70 can be evenly polished by the abrasive grains 60. As a result, the efficiency of polishing processing can be improved.

Further, in the first embodiment described above, the support members 30 have different phases in the rotation direction of the support members 30 around the support member rotation center CS. , the plurality of support members 30 do not need to have different phases in the rotation direction.

FIG. 11 is a modification of the first embodiment, and is an explanatory diagram in a case where the support members 30 have the same phase in the rotation direction. As shown in FIG. 11, the support members 30 are adjacent to each other in the circumferential direction of the barrel tank 10 with the barrel tank rotation center CB as the center, and the support members 30 are centered on the support member rotation center CS. The support members 30 may have the same phase in the rotation direction. In other words, the support members 30 are arranged so that the distance of the workpiece 70 from the barrel rotation center CB is the same between support members 30 that are adjacent to each other in the circumferential direction of the barrel bath 10 with the barrel rotation center CB as the center. , the workpiece 70 may be rotated about the support member rotation center CS.

Specifically, when polishing the workpiece 70 with the abrasive grains 60 having low fluidity, the depressions 62 generated in the abrasive grains 60 by the workpiece 70 extend to the position of the workpiece 70 on the downstream side in the rotational direction of the barrel tank 10. Although easier to reach, the support member 30 supports the workpiece 70 eccentrically with respect to the support member rotation center CS, and rotates the workpiece 70 around the support member rotation center CS.

Therefore, when the depression 62 generated in the abrasive grains 60 by the workpiece 70 on the upstream side in the rotation direction of the barrel tank 10 reaches the position of the workpiece 70 on the downstream side in the rotation direction of the barrel tank 10, the downstream side The position of the workpiece 70 in the radial direction of the barrel tank 10 moves from the position in the radial direction of the barrel tank 10 when the workpiece 70 on the upstream side generates the depression 62.

Thereby, the workpiece 70 on the downstream side in the rotational direction of the barrel tank 10 can avoid the depression 62 generated by the workpiece 70 on the upstream side in the radial direction of the barrel tank 10, and the surface can be polished by the abrasive grains 60. be able to. Therefore, even when supporting members 30 adjacent to each other in the circumferential direction of the barrel tank 10 centering on the barrel tank rotation center CB have the same phase in the rotation direction of the support members 30 centering on the support member rotation center CS. , the workpiece 70 can be polished efficiently.

The phase of the supporting members 30 adjacent to each other in the rotating direction of the barrel tank 10 in the rotating direction of the supporting members 30 about the supporting member rotation center CS is determined by the distance between the supporting members 30 and about the supporting member rotation center CS. Based on the rotational speed of the support member 30, it is preferable to set the setting so that the downstream workpiece 70 can avoid the depressions 62 of the abrasive grains 60 generated in the upstream workpiece 70.

Further, in each of the embodiments described above, the workpiece 70 is schematically illustrated as having a rod-like shape, but the workpiece 70 may be formed in a shape with unevenness. FIG. 12 is an explanatory diagram showing an example of a workpiece 70 to be polished by the barrel polishing device 1. As shown in FIG. For example, as shown in FIG. 12, the workpiece 70 may be one in which a gear 72 is provided on a rod-shaped shaft portion 71. Even if the workpiece 70 has an uneven shape like the gear 72, by polishing it using the barrel polishing device 1, the concave portions like the valleys between the teeth of the gear 72 can be polished. The abrasive grains 60 also enter, and polishing can be performed using the abrasive grains 60.

In particular, when polishing is performed while rotating the workpiece 70 around the workpiece rotation center CW by providing the workpiece rotation device 40 on the support member 30 as in the second embodiment, the gear 72 is recessed like a valley. When the abrasive grains 60 enter the concave portion, centrifugal force caused by the rotation of the workpiece 70 allows the abrasive grains 60 to come out from the concave portion. As a result, even when the workpiece 70 is formed with a recessed part like a valley in the gear 72, it is possible to suppress the abrasive grains 60 from staying in the recessed part, and the recess in the workpiece 70 can be suppressed. The abrasive grains 60 can be repeatedly made to collide with the exposed portion. Therefore, even if the workpiece 70 has an uneven shape such as a gear 72, the abrasive grains 60 are evenly impinged on the surface of the workpiece 70, including the concave portion, and polished by the abrasive grains 60. This makes it possible to improve the efficiency of polishing.

Further, in each of the embodiments described above, the barrel tank rotation device 20 that rotates the barrel tank 10 transmits the driving force from the drive device 21 to the barrel tank 10 by the drive belt 24, and rotates the barrel tank 10. , the barrel rotation device 20 may have a configuration other than this. Further, in each of the embodiments described above, the support member rotation device 35 for rotating the support member 30 is provided for each support member 30, and each support member 30 is rotated by the support member rotation device 35. The rotating device 35 may have a configuration other than this.

Further, in each of the embodiments described above, as the barrel tank 10 rotates, the abrasive grains 60 accommodated in the barrel tank 10 and the workpiece 70 supported by the support member 30 rotate relative to each other. The relative rotation of the workpiece 70 with respect to the abrasive grains 60 housed in the tank 10 may be realized in other manners. For example, a plurality of support members 30 that support the workpiece 70 are integrally configured, and the workpiece 70 supported by the support members 30 is transferred to the barrel tank 10 by rotating together. It may be rotated relative to the abrasive grains 60 contained therein. In this case, the barrel tank 10 may be stopped, may be rotating in the opposite direction to the rotation direction of the plurality of support members 30, or may be rotated in the same direction as the rotation direction of the plurality of support members 30. The rotation speed may be slower than the rotation speed of the support member 30. The support member 30 and the barrel tank 10 polish the workpiece 70 with the abrasive grains 60 by relatively rotating the workpiece 70 supported by the support member 30 and the abrasive grains 60 housed in the barrel tank 10. As long as it is configured so that the two can be rotated relative to each other, there is no particular limitation on the manner in which the two can be relatively rotated.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to those described in the above embodiments. The configurations described as embodiments and modified examples may be combined as appropriate.

1 Barrel polishing device 10 Barrel tank 11 Bottom 12 Wall 13 Opening 14 Barrel shaft 15 Pulley 20 Barrel tank rotation device 21 Drive device 22 Output shaft 23 Pulley 24 Drive belt 30 Support member 31 Rotating shaft 32 Arm 33 Support shaft 34 Support Part 35 Support member rotation device 40 Workpiece rotation device 60 Abrasive grain 61 Surface 62 Hollow 70 Workpiece 71 Shaft portion 72 Gear

Claims (10)

a barrel tank having a bottom part and a wall part formed in a cylindrical shape and standing up from the bottom part, and in which abrasive grains are stored inside the wall part;
a barrel tank rotation device that rotates the barrel tank around a cylindrical center that is the shape of the wall portion, which is a rotation center of the barrel tank;
A plurality of support members that support the workpiece by inserting the workpiece into the abrasive grains housed in the barrel tank, and rotate around a support member rotation center that is a rotation center substantially parallel to the barrel tank rotation center. and,
Equipped with
The barrel tank rotates relative to the workpiece supported by the support member,
The plurality of support members each support the workpiece eccentrically with respect to the rotation center of the support member. The support member is configured to rotate the support member rotation center such that distances of the workpiece from the barrel tank rotation center are different distances between support members that are adjacent to each other in a circumferential direction with the barrel tank rotation center as the center. The barrel polishing apparatus according to claim 1, wherein the workpiece is rotated about a center. 3. The barrel polishing apparatus according to claim 1, wherein the support member supports the plurality of workpieces eccentrically with respect to the rotation center of the support member. 3. The barrel polishing apparatus according to claim 1, wherein the support member includes a workpiece rotation device that rotates the workpiece around a workpiece rotation center that is eccentric with respect to the support member rotation center. 4. The barrel polishing apparatus according to claim 3, wherein the support member includes a workpiece rotation device that rotates the workpiece around a workpiece rotation center that is eccentric with respect to the support member rotation center. The barrel polishing apparatus according to claim 1 or 2, wherein the support member supports the shaft-shaped workpiece in a direction in which the axial direction of the workpiece is parallel to the rotation center of the support member. The barrel polishing apparatus according to claim 4, wherein the support member supports the shaft-shaped workpiece in a direction in which the axial direction of the workpiece is parallel to the rotation center of the support member. The plurality of supporting members are arranged such that when the barrel bath is rotated to polish the workpiece with the abrasive grains, a depression formed on the surface of the abrasive grain by the workpiece is attached to the processing in which the depression is formed. 3. The workpiece according to claim 1 or 2, wherein the workpiece is arranged in a positional relationship that continues to the position of the workpiece supported by the support member adjacent to the support member supporting the object on the downstream side in the rotational direction of the barrel tank. Barrel polishing equipment. The plurality of supporting members are arranged such that when the barrel bath is rotated to polish the workpiece with the abrasive grains, a depression formed on the surface of the abrasive grain by the workpiece is attached to the processing in which the depression is formed. The barrel polishing according to claim 4, wherein the barrel polishing is arranged in a positional relationship that continues to the position of the workpiece supported by the support member adjacent to the support member supporting the object on the downstream side in the rotational direction of the barrel tank. Device. a barrel tank having a bottom part and a wall part formed in a cylindrical shape and standing up from the bottom part, and in which abrasive grains are stored inside the wall part;
a barrel tank rotation device that rotates the barrel tank around a cylindrical center that is the shape of the wall portion, which is a rotation center of the barrel tank;
a support member that supports the workpiece by inserting the workpiece into the abrasive grains housed in the barrel tank, and rotates around a support member rotation center that is a rotation center substantially parallel to the barrel tank rotation center;
A barrel polishing method using a barrel polishing apparatus having a plurality of support members that individually support the workpiece,
The workpiece is supported by a plurality of support members eccentrically with respect to the rotation center of the support member,
By rotating the support member around the rotation center of the support member while rotating the barrel tank relative to the workpiece supported by the support member, the abrasive grains housed in the barrel tank can Barrel polishing method for polishing workpieces.

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